[R] cox model

From: <billemont_at_cegetel.net>
Date: Wed 04 Jan 2006 - 03:07:46 EST


I'm a french medicine student and i work on oncology. I work about treatment oh breast cancer. I have 3 sub group of patient. I made some kaplan meyer survival curve, and i made a cox model.

On the survival curve, on the last observations there is a crossmatch of the different survival curve at 150 month . I study the validity of my model by study of residual by study the proportional risk. So i used Coxzph formula, but the global test is p< 0.05, so my model is not a proportional risk.

Do you know how i can cut the cox model analysis before the 150 month, wich are the time where the curves are crossing?

Thank you for your Help

Dr Billemont



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